The Scarcity Principle makes
anything that is not easily available more desirable. If the power I have is
something that other people do not have, then I am the only wielder of this
power and hence I can choose how it is used.

If what I have is more desirable, then I can make greater demands, asking
more for it and so on.

A negative form of this is where my power is undesirable, such as the power
to punish. Again, the greater the undesirability of my power the stronger the
power is (although it will create very different reactions to a positive and
desirable thing).

Power, when used, may be used up or it may retain its 'full strength'. Thus
when a teacher shouts at a class, it will only work for a while and if they keep
it up, before long the children will ignore the loud thing at the front of the
class. A good teacher only needs to hint or raise an eyebrow.

So what?

So not only build your power, but also make it scarce, desirable, etc (as
above).